Pattern.



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Patented June 4, 1912 PATTERN.

APPLICATION FILED NOV. 27, 1911.

E. PIPHER.

COLUMBIA PLANOGRAPH C0, WASHINGTON. D. c.

- E. PIPHER.

PATTERN.

APPLICATION FILED NOV. 27, 1911.

Patented June 4, 1912.

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\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\mmm E. PIPHER.

PATTERN.

APPLICATION FILED NOV. 27, 1911.

. 1 2 02 Patent ed June 4, 1912.

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EDWARD PIPHER, OF PORT HOPE, ONTARIO, CANADA.

PATTERN.

Specification of Letters Patent.

Patented June 4., 1912.

Application filed November 27, 1911. Serial No. 662,730.

T 0 all whom it mayooncem Be it known that I, EDWARD PIPI-IER, a Britishsubject, and resident of the town of Port Hope, in the county of Durhamand Province of Ontario, Dominion of Canada, have invented certain newand useful Improvements in Patterns; and I hereby declare that thefollowing is a full, clear, and exact description of the same.

Heretofore, in preparing a mold for the casting of a metal body withprojecting parts, it has been customary to use a pattern with projectingmembers permanently aflixed to its mold forming surface, and it has alsobeen customary to use a multi-part flask for the drawing of the patternwhen the mold was formed. With the introduction of molding machinery,especially that class of molding machinery working on the jarring orvibrating principle, all at-- tempts failed to mechanically mold apattern of this character, because the projecting members of the patternimpeded the packing of the sand, especially when such projecting memberswere angularly disposed to the line of impact. I

To overcome the difliculties of preparing a mold from a pattern havingprojecting members, is the object of my present invention, and thisobject is accomplished by the use of a stationary pattern membernormally free from projecting members angularly disposed to the line ofimpact, so that the molding sand will'pack evenly against the stationarypattern member, and by the use of one or more movable pattern membersnormally contained within the stationary pattern member during thepacking of the sand, and then projected beyond it to complete theformation of the mold cavity.

While the present invention can be used for preparing a mold for thecasting of any metal body with projecting parts, I have, for the purposeof explaining its principle, hereinafter used as an example, a patternfor a kitchen sink or lavatory having lugs cast on its exterior surface.

For an understanding of my invention, reference is to be had to thefollowing description and to the accompanying drawings, in which:

Figure 1, is a vertical section of the pattern showing the stationaryand movable pattern members, flask, and molding sand. Fig. 2, is avertical section taken at right angles to Fig. 1, and Fig. 3, is ahorizontal section on the line b?) Fig. 1. 1

Like characters of reference refer to like parts throughout thespecification and drawings.

The pattern shown in the accompanying drawings, comprises a stationarypattern member a forming the bowl and back of a. kitchen sink orlavatory, and this pattern member a is fixedly attached to the patternblock or follow board I), which, during the formation of the mold, formsthe false part of the flask. As shown in the drawings, the patternmember a is free from all horizontal projecting parts which wouldprevent the molding sand coming evenly into contact with it. During themolding of the pattern, the flask 0 is placed around the pattern membera, the bottom of the flask being seated upon the pattern block or followboard. The molding sand is then placed in the flask around the pattern,and the flask and pattern are jarred vertically as indicated by arrow inFig. 1, until the molding sand is packed tightly around the pat-tern toform an imprint in exact correspondence of the external surface of thepattern member. WVhen the imprint of the external sur face of thepattern member a is made, a movable pattern member 0 is projected beyondthe external surface of the pattern a to complete the formation of themold cavity by forming, in the molding sand, the imprint for the castingof the projecting part of the metal body.

For the operation of the movable pattern member 0, I form in thestationary pat-tern member a, a slot 6, and I also form in the patternblock or follow board I), a slot 9, the end of the slot 9 engaging witha shoulder h on the movable pattern member to limit its outward movementbeyond the surface of the stationary pattern member for the completionof the mold. When the mold is formed, the movable pattern member isretracted until it is wholly within the surface of the stationarypattern member a for the drawing of the pattern from the flask. By thismeans, I am able, by jarring 0r vibrating the pattern and flask, to moldan imprint of the stationary pattern member and then mold an imprint ofthe movable pattern member or members angular to the line of impactresulting from the jar or vibration, and I am also able, upon theretraction of the movable pattern member or members within thestationary pattern member, to effect the separation of the mold from thepattern without injury to the imprint.

For the formation of a lug in parallel relation to the line of impact,as indicated by arrow in Fig. 1, I may use a movable pattern member 2',which may be retracted within the stationary pattern member during theformation of the imprint therefrom, and then advanced into the moldingsand when that imprint is finished in the same manner as the movablepattern member a, to complete the formation of the mold. As this movablepattern member i is parallel with the line of impact, it is notabsolutely necessary to retract it within the stationary pattern membera during the jarring of the pattern, and consequently it can be left ina projected position as shown in Fig. 1, until the mold is formed, andthen retracted within the stationary pattern member for the separationof the mold and pattern. For its retraction, the movable pattern memberis connected to a slide block j, having movement in slideways l0 fixedto the pattern block or follow board 6, and this slide block j isprovided with an open strap Z for an eccentric m, mounted on a shaft 79,the eccentric m, during a semi-revolution of the shaft in the directionindicated by arrow, causing the retraction of the movable patternmember, and on the completion or reversal of that semi-revolution, againrestoring the movable pattern member to its advanced position.

The movable pattern member 0 is advanced to and retracted from itsmolding position, preferably manually, but it may be advanced andretracted mechanically by means such, for instance, as those used toadvance and retract the movable pattern member 2.

The principle of my invention may be briefly summarized as a patterncomprising a normally stationary pattern member and a pattern membermovable with relation to the stationary member, to be advanced to amember a is normally stationary with rela-.

tion to the pattern members 0 and 2', and the pattern members 0 andz'are movable with relation to the pattern member a. 7

Having thus fully described the nature of my invention, what I claim asnew and desire to secure by Letters Patent, is:

1. In a pattern for molds, the combination of a stationary patternmember; a pattern block on which said member is supported provided withan elongated slot; and a longitudinally reciprocating pattern memberextending beneath said block provided with a bent portion passingthrough said slot and with another portion extending above said blockadapted to enter the sand of the mold, said bent portion adapted tocontact with one of the walls of said slot and therefore limit itsmovement, substantially as described.

2. In a pattern for molds, the combination of a stationary pat-ternmember; a pattern block on which said member is supported provided witha slot a longitudinally reciprocating pattern member extending beneathsaid block provided with a bent portion passing through said slot andwith another portion extending above said block adapted to enter thesand of the mold, said bent portion adapted to contact with one of thewalls of said slot to limit its movement; and a second reciprocatingmember passing through said block adapted to be forced into the sand ofthe mold and to contact with an edge of said stationary pattern 'member,substantially as described.

Port Hope, November 1st, 1911.

EDWARD PIPHER.

Signed in the presence of V H. T. BUSH, V

C. H. Rrorrns.

Copies of this patent-may be obtained for five cents each, byaddressingflthe Commissioner of Patents,

